Method of and apparatus for positioning liners



June 18, 1935 DOWD 2,005,577

METHOD OF AND APPARATUS FOR POSITIONING LINERS Filed Jan. 10, 1954 2 Sheets-Sheet 1 INVENTOR.

A. J. DOWD A TJ'ORNE) June 18, 1935.,

A. J. DOWD METHOD OF AND APPARATUS FOR POSITIONING LINERS Filed Jan 10, 19:54

2 Sheets Sheet 2 I INVENTOR .4. J. 00MB.

Patented June 18, 1935 PATENT OFFICE.

METHOD OF AND APPARATUS FOR POSITIONING LINERS Archie J. Dowd, Plainfield, N. .1., assignor to Western Electric Company, Incorporated, New York, N. Y., a corporation of New York Application January 10, 1934, Serial No. 706,003

11 Claims. (Cl. 153-42) This invention relates to a method of and apparatus for forming and positioning liners within receptacle and more particularly to a method of and apparatus for forming and positioning liners of magnetic material within the casings used to contain certain coils employed in the electrical arts and especially in telephone apparatus.

In certain Varieties of electrical apparatus in- 10 duction coils and the like are used in situations where it is important that the magnetic flux through and around the coil be afiorded a path of high permeability and of a nature to be little afiected by external disturbing influences. To

15 this end such coils are provided with an inner core of magnetic material of high permeability and also with an outer sheath or shield of similar material, these two elements forming a major part of the path of the effective magnetic flux.

20 The whole is usually contained for convenience and safety in some form of can or other container. For convenience in manufacture and assembly it is found best to form and position the outer sheath of the coil as a liner in the empty 25 container and then to insert the naked coil and its core into the lined container.

It is one object of the presentinvention to provide a rapid and convenient method and a simple and reliable apparatus for putting such liners into such containers, although neither the method nor the apparatus is necessarily limited to application to these particular articles.

With this and other objects in View the invention contemplates a method of and apparatus for forming and positioning liners in a container which comprises rolling up a liner blank on an appropriately shaped mandrel or forming member while at the same time forming the blank thereon into substantially the requisite form of slightly less dimensions than the container, in

sertingthe formed liner into an appropriate container, and releasing and withdrawing the mandrel therefrom. A suitable apparatus for practicing the method of the invention is provided with appropriate means as hereinafter described 5 Fig. 1 is a diagrammatic view in perspective of an apparatus constructed in accordance with the invention and adapted to carry on the method of the invention in forming and placing open ended liners in a cylindrical container;

Fig. 2 is a detached enlarged view in trans- 5 verse section on the line 22 of Fig. l of the mandrel and coasting block;

Fig. 3 is a transverse section of a finished cylindrical armored coil in a container having a liner;

- Fig. 4 is a broken view similar to Fig. 1 of an apparatus for use in the case of a coil of rectangular cross-section having a closed end liner in the casing thereof;

Fig. 5 is an enlarged broken detached view in longitudinal section on the line 5-5 of Fig. 4;

Fig. 6 is a similar View on the line 66 of Fig.

4, and

Fig. '7 is a detached section on the line ll of Fig. 5 to show one of the forming rolls.

In the apparatus shown in Figs. 1 and 2 for producing a coil such as is shown in Fig. 3, there is provided a base 2E! of any approved construction and form'which may be mounted upon any convenient and stable support 2! and attached thereto if desired by any suitable means not shown.

A former block 22 is mounted rigidly on the base 20. A pair of L-shaped members having spaced upstanding lugs 23 and 24 is located on the base at the right of the block, and a pair of spaced supporting blocks 25 and 26 is positioned on the base at the left of the block and attached rigidly thereto. A stop 27 is mounted on the base at the left of the block 26. These six elements 22, 23, 24, 25, 2t and 2? are rigidly attached to the base in any approved fashion, as by welding, or by means of bolts or screws, etc., the means to this end being irrelevant to the invention and so not shown.

The block 22 is provided with a longitudinal cylindrical bore 28 intersected by one longitudinal face of the block, here'shown as the slanting face 29, thus forming a longitudinal aperture or slot 30 affording lateral entry to the bore. The lugs 23 and 24 are provided with cylindrical perforations in alignment with the bore 28, in which a cylindrical shaft 3i is mounted with freedom to rotate and to slide longitudinally therein. The right hand end of the shaft is 5 provided with a rigidly attached crank and handle 32 and 33 respectively. 7 The left hand end of the shaft is a cylindrical mandrel or former 3 idimensioned to enter and pass through the bore 28 with a clearance therebetween determined by the purposes to be subserved thereby as disclosed below. The mandrel 3a is provided with a longitudinal slot 35 positioned with its principal transverse dimension as nearly tangential to the surface of the mandrel as may conveniently be.

Each of the blocks 25 and 25 is notched. as shown in the top surface thereof and is so positioned and dimensioned as to support a cylindrical container 36 with one end snugly against the block 22 and in axial alignment with the bore 28, the other end of the container abutting against and being supported against longitudinal displacement by the stop block 27.

With the parts in the position shown in Fig. 1 and with an empty container in place on the blocks 25 and 26 as shown, one edge of a rectangular blank 3? of suitable alloy of appropriate material and dimensions is fed into the slot 35. Such a blank may be for example a sheet of silicon steel having a width equal to the depth of the container and a length sufficient to be coiled twice within the container. Turning the handle 33 counterclockwise as seen from the left in Fig. 1 will then draw the blank in between the wall of the bore 28 and the mandrel 34 as shown in Fig. 2, and will coil the blank and form or set the same in two laps and a trifle more about the mandrel, the bore 28 being a little smaller than the container. The shaft 3i is then pushed to the left and carries the blank with it into position in the container 36. When the blank is thus completely released from the bore 28, the residual elasticity of the blank asserts itself, and, since the bore 23 is somewhat less in diameter than the container, the blank loosens its tight embrace on the mandrel and expands to fit snugly within the container and be held there frictionally while the mandrel is withdrawn. The lined container may then be replaced by another empty one and the process repeated.

Fig. 3 shows a cross section of a container 36 and liner 3'? with a coil comprising a winding 38 and core 39 therein. If it is desired to line the ends as well, appropriate disks or cups of the same material as that of the liner may be inserted.

In the modified form disclosed in Figs. 4, 5, 6 and l, the general structure and arrangement of the apparatus are the same. The bore 28 and. the mandrel 34 are, however, substantially rectangular in cross-section being adapted to form a liner 3? for a rectangular shaped container. Each of the four sides of the bore 28 is provided with a recess GE] to receive a corresponding yieldable forming member 4! pressed inwardly toward the axis of the bore by springs 42 and provided with forming rollers Q3 journalled in the members ii.

A pair of plungers Q4 and 55 respectively, is slidably mounted in corresponding slanting bores in the block 22 at the left. The exterior end of each is provided with a pin which enters a slot in a corresponding lever, MS and 41 respectively, pivotally' supported on the block 22 or on a bracket carried thereby. The outer ends of the levers 36 and M are pivoted to a vertical link 48 extending down and ending in a treadle 49. A tension spring 56 attached at its lower end to a lug on the link 48 and at its upper end to a bracket on the block 22 tends to urge the link upwardly and thus to retract the inner ends of the plungers M and 45 from the bore 28.

In operation, with the mandrel housed within .the' bore 28, a'liner blank 31 is fed into the slot closing the left end of the formed lining.

35 and the crank 32 turned counterclockwise as seen from the left. The blank is thus wrapped a little more than once, in this case, about the mandrel and formed thereon by the rolls 43. When the condition shown in Fig. 6 is arrived at, the treadle 49 is pressed down and the upper and lower parts of the portion of the blank which overhangs the end of the mandrel are thus folded down. The mandrel is thenrotated 90 and its other two sides folded in the same way thus If necessary the lining blank may be preformed on its left edge with four triangular flaps for this purpose.

The liner is then inserted into the empty casing 35 as before and the core and coil placed therein, after which, if desired, the open right end of the liner may be closed by folding or by the insertion of a rectangular cup or disk.

The plungers 44 and 45 are set at an obtuse angle to each other to fold the end of the liner in beyond a right angle to compensate for the elasticity of the liner material, which springs back when released, or is forced back by subsequent insertion of the coil and its core to be substantially at right angles to the side walls of the formed liner.

The embodiments of the invention herein disclosed are illustrative merely and may be modified and. departed from in many ways without departing from the spirit and scope of the invention as pointed out in and limited solely by the appended claims.

In particular it may be pointed out that the apparatus might also be constructed with the mandrel having freedom to slide only, and the former block mounted to be rotatable about the mandrel to coil the blankthereon, a characteristic of one phase of the invention being that the blank is releasably gripped by the mandrel, is formed within the former by relative rotation of the mandrel and former, and is withdrawn from the former and inserted in a container by relative longitudinal motion of the mandrel and former.

What is claimed is:

1. A method of forming a liner blank and positioning the same in a container which comprises the steps of detachably securing a liner blank to a mandrel within a coacting former, forming the blank upon the mandrel within the former, removing the mandrel and formed liner from the former, inserting the same into a container, and withdrawing the mandrel from the liner and containel'.

2. A method of forming a liner blank and positioning the formed liner in a container which comprises the steps of detachably securing a liner blank to an internal forming means positioned Within an external forming means, forming the blank, removing the internal forming means and i the formed liner from the external forming means, inserting the same into a container, and withdrawing the internal forming means from the liner and container.

3. A method of forming a liner blank and positioning the formed liner in a container which comprises the steps of detachably securing a liner blank to a forming member, forming the blank thereon by relative rotation between the forming member and a second forming member one about the axis of the other, separating the first forming member and the formed liner from the second forming member byrelative longitudinal motion,

inserting the first forming member and the .7

formed liner into a container, and withdrawing the member from the liner and container.

4. A method of forming a liner blank and positioning the same in a container which comprises the steps of detachably securing a liner blank to a mandrel within a coacting former, forming the blank upon the mandrel within the former, removing the mandrel and formed liner from the former and simultaneously inserting the same into a container, and withdrawing the mandrel from the liner and container.

5. A method of forming a liner blank and positioning the formed liner in a container which comprises the steps of detachably securing a liner blank to an internal forming means positioned within an external forming means, forming the blank, removing the internal forming means and the formed liner from the external forming means and simultaneously inserting the same into a container, and Withdrawing the internal forming means from the liner and container.

6. A method of forming a liner blank and positioning the formed liner in a container which comprises the steps of detachably securing a liner blank to a forming member, forming the blank thereon by relative rotation between the forming member and a second forming member one about the axis of the other, separating the first forming member and the formed liner from the second forming member by relative longitudinal motion and simultaneously inserting the first forming member and the formed liner into a container, and withdrawing the member from the liner and container.

7. A method of forming a liner blank and positioning the same in a container which comprises the steps of detachably securing a liner blank to a mandrel within a coacting former, forming the blank upon the mandrel Within the former, closing one end of the blank, removing the mandrel and formed liner from the former, inserting the same into a container, and Withdrawing the mandrel from the liner and container.

8. A method of forming a liner blank and positioning the same in a container which comprises the steps of detachably securing a liner blank to a mandrel within a coacting former, forming the blank upon the mandrel within the former, closing one end of the blank, removing the mandrel and formed liner from the former and simultaneously inserting the same into a container, and withdrawing the mandrel from the liner and container.

9. In an apparatus for forming a liner blank and positioning the same within a container, a first forming means, a second forming means coacting therewith and slidable into and out of operative relation thereto, means to efiect relative rotation of the two forming means to form a liner blank, and means to support a container to receive the formed liner and the second forming means when the latter is out of operative relation to the first forming means.

10. An apparatus for forming a liner and positioning the same within a container comprising a mandrel mounted for rotation and for axial displacement into either of two positions, forming means to coact'with the mandrel in one position thereof to form a liner blank on the mandrel, and means to support a container to receive a formed liner from the mandrel in the other position thereof.

11. An apparatus for forming a liner and positioning the same within a container comprising a mandrel mounted for rotation and for axial displacement into either of two positions, forming means to coact with the mandrel in one position thereof to form a liner blank on the mandrel, other means to form a closed end on the liner, and means to support a container to receive a formed liner from the mandrel in the other position thereof.

ARCHIE J. DOWD. 

